docs: def get_mem_total(self):
          """Calculate the total memory in the current service unit."""
          with open('/proc/meminfo') as meminfo_file:
              for line in meminfo_file:
                  key, mem = line.split(':', 2)
                  if key == 'MemTotal':
                      mtot, modifier = mem.strip().split(' ')
                      return '%s%s' % (mtot, modifier[0].upper())